| LI Zhou,YANG Zhong,YU Li-xin.Evaluation of radiation level in selected mines in Guizhou[J].Chinese Journal of Radiological Medicine and Protection,2008,28(6):569-571 |
| Evaluation of radiation level in selected mines in Guizhou |
| Received:July 31, 2008 |
| DOI： |
| KeyWords:Non-uranium mine Radon Thoron Radionuclide γ-radiation |
| FundProject:科技部科研院所社会公益研究专项(2005DIB1J087) |
| Author Name | Affiliation | | LI Zhou | Department of Radiation Hygiene, Guizhou Province Center for Disease Prenvention and Control, Guizhou 550004, China | | YANG Zhong | Department of Radiation Hygiene, Guizhou Province Center for Disease Prenvention and Control, Guizhou 550004, China | | YU Li-xin | Department of Radiation Hygiene, Guizhou Province Center for Disease Prenvention and Control, Guizhou 550004, China | | 田祝娟 | Department of Radiation Hygiene, Guizhou Province Center for Disease Prenvention and Control, Guizhou 550004, China | | 张小乐 | Department of Radiation Hygiene, Guizhou Province Center for Disease Prenvention and Control, Guizhou 550004, China | | 苏旭 | 中国疾病预防控制中心辐射防护与核安全医学所 |
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| Abstract:: |
| Objective To investigate and assess the radiation level in selected mines including mines of aluminum, manganese, antimony, phosphate and mercury in Guizhou province.Methods Radon and thoron concentrations were measured for 2×6 months using integrating method. Radionuclides in ore and soil, levels of γ-rays in mine lanes, and total α- and β-radioactivity in mine water were determined.Result Higher levels of radon and thoron were found in an aluminum mine. Radon concentration ranged between 626.0 and 3866.0 Bq m3 in the first half year, and between 38.9 and 655.0 Bq m3 in the second half of the year; average was estimated to be 373.7Bq m3. For thoron, the corresponding values were 626.0-4834.0 Bq m3, 40.9-344.0 Bq m3, and 1221.4 Bq m3, respectively. Radon and thoron were found in all other mines but with lower levels. Radionuclide concentration in the ore was normal, 6.9-511.9 (Bq/kg) for 226Ra, 1.4-536.7 (Bq/kg) for 232Th, and <17.5-433.7 (Bq/kg) for 40K. Highest γ-radiation level was found in the aluminum mine with average of (87.0±8.1)×10-8Gy/h, and lowest values in an antimony mine with average of (6.0±1.9)×10-8Gy/h. Total α-radioactivity in ore ranged from -2Bq/L, and β-radioactivity from -2Bq/L. Conclusions High concentrations of radon and thoron were found in the mine lanes in the selected aluminum mine, about 78 and 15 times higher than those in the nearby open-air environment, though the mine were relatively good in term of mechanical ventilation and natural ventilation. γ-radiation level was elevated too, about 6.5 times higher than the provincial average of environmental γ-radiation level. Workers working in the aluminum mines received extra dose from their occupation exposures to natural radiation. |
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